In earlier versions of Mac OS X, the kernel was essentially single-threaded.

Single Use: places no restriction on which (if any) version of Mac OS X should already be installed.

Every time a major new version of Mac OS X is released, it behooves developers to profile their applications again.

Other operating systems, including Microsoft Windows and older versions of Mac OS X, are not supported.

This is in contrast to all previous versions of Mac OS X, where dragging down scrolls up and vice versa.

The latest version of Mac OS X is Lion (10.7).

Each new version of Mac OS X has been faster on the same hardware than its predecessor.

It is a version of Mac OS X, and carries the release number 10.5.

Earlier versions of Mac OS X supported a form of automatic saving.

The completed commercial version of Mac OS X will ship March 24 and be priced at $129.